I have delt with mites before and the best advice I can give is to clean out the cage completely and use paper towel or newspaper for substrate. Allow the animal a water bowl so that if she wants to soak she can. If she has mites you will see them moving on her and she will soak to try and get rid of them. Also what I did to fight the mites was to every 3 days clean the cage and the bowl with a bleach solution and redo the paper.

As for the animal I got a Ivermectin solution from the vet. You spray it all over the animal once every two weeks. The solution was of such a low concentration that it woul not harm the snake. If you can get this I suggest soaking the animal in a bath of warm water with some olive oil. Keep this up and in about 2-3 months they should be gone.

As for the stargazing if it is that I would be worried about IBD, Inclusion Body Disease. This is fatal 100% of the time. Really the only way to test if with a blood test. I really hope that is not what she has.

I hope this helps